Update app.py

app.py

@@ -163,12 +163,12 @@ def question_answer(url, file, question,openAI_key):
     else:
 
         uploaded_pdfs = []
-        for file in files:
-            old_file_name = file.name
-            file_name = file.name
-            file_name = file_name[:-12] + file_name[-4:]
-            os.rename(old_file_name, file_name)
-            uploaded_pdfs.append(file_name)
+        if files:
+            for file in files:
+                pdf_name = file.get().name
+                pdf_name = pdf_name[:-12] + pdf_name[-4:]
+                file.save_to(pdf_name)
+                uploaded_pdfs.append(pdf_name)
 
         combined_pdf_path = merge_pdf_files(uploaded_pdfs)
         load_recommender(combined_pdf_path)